Additional grain boundary strengthening in length-scale architectured copper with ultrafine and coarse domains

Xiaodong Hou; Sebastian Krauß; Benoit  Merle

doi:10.1016/j.scriptamat.2019.02.019

Additional grain boundary strengthening in length-scale architectured copper with ultrafine and coarse domains

Xiaodong Hou, Sebastian Krauß, Benoit Merle

University of Erlangen-Nürnberg

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

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Abstract

The strength of polycrystals is known to increase with decreasing grain size, known as Hall-Petch effect. However, this relationship fails to predict the strength of samples with a non-uniform distribution of grain sizes. In this study, we purposely designed and fabricated copper micropillars with a strongly bimodal microstructure: half volume consisted of a large number of ultrafine grains, while the other half was predominantly single-crystalline. Micropillar compression evidenced that bimodal samples are 35% stronger than their counterparts containing only ultrafine grains. This paradoxical finding highlights the greater strengthening potential of microstructure distribution engineering, compared to the traditional grain refinement strategy.

Original language	English
Pages (from-to)	55-59
Number of pages	5
Journal	Scripta Materialia
Volume	165
Early online date	19 Feb 2019
DOIs	https://doi.org/10.1016/j.scriptamat.2019.02.019
Publication status	Published - May 2019

Keywords

Bimodal grained microstructure
Crystal structure
Grain boundary strengthening
Hall-Petch effect
Mechanical property testing

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2019.02.019

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title = "Additional grain boundary strengthening in length-scale architectured copper with ultrafine and coarse domains",

abstract = "The strength of polycrystals is known to increase with decreasing grain size, known as Hall-Petch effect. However, this relationship fails to predict the strength of samples with a non-uniform distribution of grain sizes. In this study, we purposely designed and fabricated copper micropillars with a strongly bimodal microstructure: half volume consisted of a large number of ultrafine grains, while the other half was predominantly single-crystalline. Micropillar compression evidenced that bimodal samples are 35% stronger than their counterparts containing only ultrafine grains. This paradoxical finding highlights the greater strengthening potential of microstructure distribution engineering, compared to the traditional grain refinement strategy.",

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doi = "10.1016/j.scriptamat.2019.02.019",

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T1 - Additional grain boundary strengthening in length-scale architectured copper with ultrafine and coarse domains

AU - Hou, Xiaodong

AU - Krauß, Sebastian

AU - Merle, Benoit

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Y1 - 2019/5

N2 - The strength of polycrystals is known to increase with decreasing grain size, known as Hall-Petch effect. However, this relationship fails to predict the strength of samples with a non-uniform distribution of grain sizes. In this study, we purposely designed and fabricated copper micropillars with a strongly bimodal microstructure: half volume consisted of a large number of ultrafine grains, while the other half was predominantly single-crystalline. Micropillar compression evidenced that bimodal samples are 35% stronger than their counterparts containing only ultrafine grains. This paradoxical finding highlights the greater strengthening potential of microstructure distribution engineering, compared to the traditional grain refinement strategy.

AB - The strength of polycrystals is known to increase with decreasing grain size, known as Hall-Petch effect. However, this relationship fails to predict the strength of samples with a non-uniform distribution of grain sizes. In this study, we purposely designed and fabricated copper micropillars with a strongly bimodal microstructure: half volume consisted of a large number of ultrafine grains, while the other half was predominantly single-crystalline. Micropillar compression evidenced that bimodal samples are 35% stronger than their counterparts containing only ultrafine grains. This paradoxical finding highlights the greater strengthening potential of microstructure distribution engineering, compared to the traditional grain refinement strategy.

KW - Bimodal grained microstructure

KW - Crystal structure

KW - Grain boundary strengthening

KW - Hall-Petch effect

KW - Mechanical property testing

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DO - 10.1016/j.scriptamat.2019.02.019

M3 - Article

SN - 1359-6462

VL - 165

SP - 55

EP - 59

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Additional grain boundary strengthening in length-scale architectured copper with ultrafine and coarse domains

Abstract

Keywords

ASJC Scopus subject areas

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